Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffef22f5ac268772…

MALICIOUS

PDF

108.9 KB Created: 2021-07-01 17:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75c2b3af476f1950af5cec820393043d SHA-1: f2a50563e9a4347441c35fa0169b20757529c69b SHA-256: ffef22f5ac26877273ca11e06f27ba51d2821e5b6a441e98acb8698f07a14686
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress installations and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=the+divided+line+philosophy
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29b14b7e8e---samoravijet.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a5b10dbad3977f42f9cff9a751cb5853/86358215140.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805e5b6114f---71804867450.pdf
    • http://vogiantinhmach.com/media/ftp/file/24915767859.pdf
    • http://jejuecotech.com/ckupload/files/gutelasinajikozo.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607548d35a956---gitarefapemamoxajovi.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086373a6f720---nabasubobij.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075859ddb33c---pixab.pdf
    • http://bukharasuwanee.com/sites/default/files/file/bafevogesanivotewalusazo.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608153d9183b4---12652480828.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16af18b8b---41405936336.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/k2a2880h3g7qq0jr9o2a22j62p/90051397398.pdf
    • http://nfrostov.ru/upload/files/93885881164.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ota7330tto7331m41k5eiv1vo5/zusuzupijipowe.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607724061dbc2---gonakefowuniwono.pdf
    • https://bursakaynak.com/userfiles/file/37809056856.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/148562ce9bdfcac5520a4c1c5c11ff2b/21368522818.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/203da4ad51091b315a1e094a37868207/15654035075.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a716e4392d1---biwiposamu.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fe16b54c---xakofokem.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/n499ik1mijhnhik7av7lreukn2/40654705074.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014028.bin
cd9eab5d4917c1bea915acfc9db1b36ae70f17cbd5b14e1705e3c28bbd9ad111
pdf-font-stream PDF embedded font (sfnt) at offset 0x14028 10272 bytes
font_01_sfnt_off00015727.bin
f120321234d2146257c5948f6a9d68896be0767c88fcc2c191032e01739d05e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x15727 21544 bytes
font_02_sfnt_off00018e75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18E75 16792 bytes